1.I do not listen to music,take cell phone calls, etc. I am too old to complicate my life and safety while riding. I have only the current North America map which is overkill for me as 150 +/- is my limit for riding at this age. I use the GPS, strictly for turn by turn audio directions, don't even look at the screen when on the road.
What exactly is the use of the additional memory the card provides? Would I get any noticeable benfit from having a card in the slot? I was going to put a card in, at least for good luck anyways
2. I have a couple of extra Sandisk 64Gb Extreme Pro cards I bought for use with my wee little GoPro cube.( They are marked V30 & A2) Would those cards be sufficient for general use on the Zumo?
3. If I felt for some reason, I wanted a larger card, say 128Gb or larger, what is the lowest level card I should get? I had tried some lesser cards on the GoPro a ways back but they didn't work as smoothly. I then discovered there were ever increasing levels of "performance" and the Extreme Pro version was recommended. Never had a prob recording on the GoPro since.
Obviously I am Tech Difficient but trying to learn something in my declining years.

Thanks all for your wisdom,
Stay safe.
DH